Sara Ali Khan's second film will be for Karan Johar.

While Saif Ali Khan and Amrita Singh's first-
born failed to make her debut in a Karan
Johar film she will nonetheless do her
second film with the banner she was
destined to make her debut with.
Says a source close to Karan Johar's Dharma
Productions, "Karan was very keen to
launch Sara Ali Khan. In fact he was morally
committed to launch Saif and Amrita's
daughter. Before he could find the right
vehicle Sara was whisked away by Abhishek
Kapoor to do Kedarnath while Karan got
busy with the launch of the other star-
daughter Jahnvi Kapoor. But he hasn't
forgotten his commitment to Sarah and he
will be producing Sarah's second film.
Interestingly Sara Ali Khan plays a rich spoilt
brat in her debut film Kedarnath, much in
the same way as her mother Amrita Singh
had done in her debut film Betaab.

http://www.bollywoodhungama.com/news/bollywood/sara-ali-khans-second-film-will-karan-johar/.